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For the equilibrium: 2NO(g) + O2(g) left...

For the equilibrium: `2NO(g) + O_2(g) leftrightarrow 2NO_2(g), K_c=6.45 xx 10^5` . (i) At what `O_2` concentration is the `NO_2` concentration equal to the NO concentration?
(ii) At what `O_2` concentration is the `NO_2` concentration 100 times the NO concentration?

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`1.55 xx 10^(-6) , 1.55 xx 10^(-2)`
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